These are what we call the 'YMMV items.' Things that some people find in this work. We call them 'your mileage might vary' because not everyone sees these things in the same way. This starts discussions in the trope lists, a thing we don't want. Please use the discussion page if you'd like to discuss any of these items.
"Funny Aneurysm" Moment/Harsher in Hindsight: This parody depicts Hitler's TV channel getting hijacked by Fegelein via a transmission showing Eduard Khil singing Trololo, during which Hitler suffered a stroke and was taken to a hospital. Years later, Khil suffered a stroke that took his life.
Growing the Beard: When it initially took off, most of the videos were just Hitler ranting about whatever he was informed of in the video and only used two scenes from Downfall, Hitler's rant regarding Steiner's failure and the scene where Gunsche informs Hitler of Fegelein's desertion. The videos began to evolve once more Downfall scenes were used and more named characters emerged, being given various personalities rather than just being unnamed informers (Fegelein and his antics, Gunsche as the Captain Obvious informer, Jodl as the Commander Contrarian, etc.)
Ho Yay: Krebs and Burgdorf. Also Hitler and Gunsche. No, really.
Kate Bush as well. Not only is she the most talented singer in the Parody Universe, but she's led entire armies against Bieber's fans and several times and always won. I think it's worth pointing out that when the United Bieber Fever Alliance first appeared the entire German army couldn't stop them, but a platoon of Kate Bush fans come onto the scene and they immediately start dropping like flies.
Another rather unnerving one is Slender Invades the Bunker. After a camping trip in a certain forest, Fegelein mails Hitler 8 mysterious pages. At that point the lights start going out, and disturbing sounds are heard throughout the Bunker as Slenderman picks off the Bunker's occupants one by one, causing increasing panic for those trapped within as their numbers dwindle. It ends however with a rare awesome moment for Hitler as he alone has the balls to shout "Fuck you!" at Slenderman and call him out on his obsession with the pages.
The Menace of Fegel-Forest also involves the bunker gang along with some of the U-Boat and Stalin Parody crews going up against the Slender Man. Though the edge may be taken off by the fact that Mallory kills the Slender Man.
Nightmare Retardant: The Goebbelman in itself is a generally scary video in the series about the ghost of Joseph Goebbels haunting the bunker, possessing people as he go... But if you look closely in the background while his is possessing his wife trying to convince Hitler into going to sleep, you will notice that the actual Joseph Goebbels is present in blink-and-miss moment behind her.
Strawman Has a Point: Usually Hitler is presented as the embodiment of Hatedom during his rants, but other times he actually presents legitimate arguments. Expect lots of comments saying "Never thought I'd agree with Hitler" when that happens.