Alternative Character Interpretation: Since the outcome of each season is determined entirely by the Random Number God, it can be very easy to come up with different explanations and motives for tributes actions throughout a season, typically by using knowledge of their canon counterpart and what they went through previously in the HGS to theorise what their HGS self could actually be like.
Anti-Climax: More often than not, when there's only two tributes left in the game, one of them will kill the other in an instant. Sometimes one of them dies of natural causes.
Archive Panic: Since its creation, the Original Generation hosted 250 seasons across 1,200+ pages. However, there's little continuity (lore aside) and tributes can be re-nominated, so anyone can jump right in.
Award Snub: Sometimes external circumstances ruin a tribute's chance at a spot on the Hall of Fame.
Many believe Gabby to have been snubbed by Romsca in OG Season 234. Due to an incident where Romsca got into an undesirable event with Will Stronghold, causing the original save to be discarded and the season started over, Gabby was robbed of the win and most kills that she would have had.
The original save for OG Season 238 was accidentally lost. In it, Fuyuhiko Kuzuryuu would have gotten most kills and Vilgax would have made 3rd place * the latter in particular would have been monumental because it would have made Vilgax the first Ben 10 Hall of Famer that wasn't a bootleg (for context, legitimate Ben 10 tributes tend to perform very poorly). In the canon save, however, Alec Trevelyan killed BOTH of them, depriving them of a chance at becoming Hall of Famers.
Trevelyan himself, however, averts this, since he was 2nd place in the original save and won in the canon save.
Cry for the Devil: The RNG of OG Season 183 invokes this a little too well in the case of Tomura Shigaraki. All of his hardships throughout the season and his genuine reactions to them really struck a cord with the players.
Fan Myopia: Since a lot of events are references to various works, chances are that they might just fly over the players' heads if they're not familiar with the works. When suggesting these kinds of events, it's advisable to word them in such a way that even those not familiar with the works can follow along, but sometimes they still fail to get them as well.
In OG Season 179, on Day Two, Flabébé went on an angry tirade about how she hated Fidget, Azmuth, and Sukuna, and that they drove her to drink. When Azmuth did her in on Day Five, this became much less funny. It seems that Flabébé had a really good judge of character.
Meta example: Before OG Season 98 began, Troper No. 9001 jokingly suggested that Heathernote who was Bacon Zorp at the time should nominate Dr. Livings because the former suggested a necrophilia event for the tribute. Heather granted her request, but the event itself wasn't added. OG Season 154 then showed why said event wasn't added back in Season 98 in the first place: the players (9k1 included) were Squicked out by several tributes making out with the corpses of fallen tributes.note The event however, was suggested by The Gamechanger during Season 152, which was tame in comparison to 9k1's, which involved the tribute fading to black with the corpse. As a result, the event was sent back to the morgue from the next season onwards.
Another meta example: In OG Season 125, PresidentStalkeyes died of flesh-eating bacteria. Ichigo Montoya commented on how he wished the former was still active to see the shenanigans that was going on with him, only to diss it as anticlimactic for him. But in OG Season 190, when a hawk and the Scary Maze Game died of the same infection on the same night, 4fterthought got triggered by it because of her hypochondria. As a result, the event got sterilized from the next season onwards.
In OG Season 98, Undyne got stuck in a ditch with all of humanity. Troper No. 9001 got worried, since in her game, Undyne hated humanity for trapping all the monsters Underground. Then in OG Season 208, Undyne killed half of the population (specifically the females), all for killing her father.
History Repeats for him in Reboot Season 32, where he also went hardcore and killed several tributes, even corrupting Dinosaur Ryuzaki. While he made the podium again (this time in 3rd Place as opposed to winning), he wasn't the most murderous, with the honor going to Ryuzaki and Valerio Calvados instead. Lucy also appeared in this season, but he didn't kill her. Instead, she was beaten up by an invincible Caim.
In a gag reel of OG Season 195, Riley Andersen tried not to cry, only to end up crying a lot. This is harsh due to the fact that Riley believes that she shouldn't be sad for her parents' sake, and Inside Out's conflict is directly influenced from this belief. Fortunately, she grew out of it.
In OG Season 207, Héctor teamed up with Eve and the Elite Beat Agents for a Battle of the Bands against Reddit, Godzilla and Zamasu, only for them to lose. Then the next day, he got fired from his job via FedEx. While this is already bad enough, it gets worse when you remember that he was a singer/songwriter in his movie, and Ernesto de la Cruz killed him and stole all of his songs just for fame and fortune.
Mis-blamed: In OG Season 186, Kanaya Maryam drew ire from the players by shooting Ichabod, an "innocent" dog, and laughing about it for the rest of the day. However, it was discovered several seasons later (in OG Season 210) upon rereading the summary of that Season that Kanaya actually had a legitimate reason to kill Ichabod. Prior to his death, Ichabod had poisoned Kanaya's fellow troll, Terezi, and teamed up with Eijirou Kirishima to kill two other tributes. With this in mind, Ichabod wasn't so innocent after all!
That being said, however, the players had their own reason to give their ire, since while Ichabod wasn't completely innocent, Kanaya went over the top by laughing about it for the rest of the day. That was why most participants thought Kanaya's death the same night (due to meth cooking gone wrong) was a karmic retribution.
Older Than They Think: Oftentimes, players nominate tributes without realizing that they were nominated many seasons before, whether or not they were originally from the OG. Not that this is a problem, since all tributes are free-for-all.
Overshadowed by Controversy: OG Season 230 saw Star Android Jaguar getting his first champion, Natu. However, all participants have unanimously agreed that it was the most infamous Season to date. This Season saw an extremelySquicky event happen between Gundham Tanaka and Star Swirl the Bearded. Events such as this have happened many times before, but this one ended up being the straw that broke the camel's back. As a result from this "Gunstargate" fiasco, steps are now being taken to be sure that no such events occur in future Seasons.
Rooting for the Empire: In OG Season 183, the players found themselves feeling bad for Tomura Shigaraki, of all people. It isn't every day that you have the players legitimately feeling sorry for a tribute as nasty as Tomura is in canon. Just about everyone was cheering for him and hoping that he would win, and the players rejoiced when he actually ended up winning. This kind of thing was pretty much inevitable, seeing as all of the tributes for that season were villainsnote except for Eric Cartman.
Azmuth's actions in OG Season 179 did little to earn him fans. He took a MAJOR level in jerkass after he teamed up with three other tributes to kill the peep bunny. His descent into jerkassery started on Night Three when he pushed Fuyuhiko Kuzuryu into a mud puddle. After that, he killed two player favorite tributes, Flabébé and Stitch. The latter death was made even worse by the fact that Stitch was one of the tributes who teamed up with him against the peep bunny. Not only that, but he also pleasured himself to Ant-Man crushing Piglet's skull in his hands. Needless to say, the players rejoiced when Gourgeist shoved him into a meat grinder during the Feast.
Most suicides, particularly the Suicide Pact and the failed double suicide, to the point that they have been removed from Season 19 and on, since they tend to kill off too many tributes early. It doesn't help that both of them are programmed to happen even during the bloodbath in the vanilla version of the sim. The standard singular suicide has since been re-implemented, but not within the bloodbath.
Arena events can shake up seasons, but when they happen on the first day, they tend to wipe out massive numbers of tributes before they can do anything interesting, oftentimes ending seasons too quickly or dragging them out too long with deathless days. Some hosts will even abort a run featuring a day one arena event and run the simulation again before sharing.
Also, the inability to set the likelihood of arena events. In the simulator, you can set the likelihood of fatal events to low, moderate, or high, but this cannot be done for arena events. They can only be enabled or disabled. Because of this, a good save can be hard to come by when early arena events keep popping up.
In addition, if the event is worded such that any tribute other than the first one dies first, the placements would be messed up due to the way the death order works.note When multiple tributes die in the same event, the order of deaths is from left to right.
The "long, drawn-out battle" event, where one tribute kills another before being killed by a third tribute, was first added in OG Season 25, but later seasons showed how problematic that was. Not only did it register excess kills for both killers, resulting in mass murderers being unfairly qualified for Murderers' Death Battles, but it also resulted in incorrect placements due to the way deaths are ordered.note The event had the second tribute dying first. This event reared its ugly head in OG Seasons 36 and 89, where Es and George Washington should've switched places for 3rd in the former, and Big the Cat and Kellam likewise should've switched places for 3rd in the latter. Even after the event was reworded in OG Season 146, it still had the "excess kills" problem, and it was ultimately retired in OG Season 182.
Rescued from the Scrappy Heap: Said event was reworded in OG Season 186, where this time, one tribute ambushes two others after they both collapse from their long, drawn-out battle, with no indication that one of the fighters killed the other. Likewise, the steel chair event was made clear that one tribute kills another with the chair to protect a third tribute. Originally, it was worded in such a way that this situation wasn't implied, and it was also coded so that the one being saved somehow died for no reason.note This was because when Alexius 08 added the event before OG Season 128 (which was suggested by Sun Guy The3rd), he was confused with the ambiguous wording of the event and assumed that the chair wielder killed both tributes. The players just went along with that interpretation until one of the participants called out on it when one of their tributes was killed in the event. As of OG Season 217, there's now a variant of the steel chair event that goes by Alex's interpretation, and this time, it's made clear that the chair wielder killed both tributes with it.