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.
Fan-Preferred Couple: Following the events of the eighth season, a fair few fans want Janet and Wesley to get together.
When it looked as if Gaz and Janet were going to become an Official Couple, the fans clamoured for Gaz and Donna to make a return. It worked.
Fetish Fuel: Parodied in one episode where Janet dresses in a bikini made of pasties for Jonny.
Harsher in Hindsight: In the episode Lard, Janet and Donna agree that Jimmy Savile was an even greater tragedy of our time than male bonding. At the time, Susan Nickson probably had in mind Savile as the naff, shellsuit-wearing, cigar-smoking TV presenter. However...
He's Just Hiding: Many fans speculate - as well as hope - that this is true of Jonny. After all, nobody actually sees him die, and since he was savaged by a shark, it could be possible that the body was too mangled to be properly identified...
It's the Same, Now It Sucks: The Gaz/Janet affair of the Seasons 7 and 8 is often accused of re-treading the same ground as their original "one night stand" storyline of earlier seasons.
Jumping the Shark - The entire concept of this trope is spoofed in the seventh season opener, 'When Jonny Met Sharky'. Ironically, however, many feel that the seventh season did indeed jump the shark, for various reasons.
Les Yay: A Donna/Louise/Janet moment in the second season, as well as several Janet/Kelly and Louise/Kelly moments.
Nightmare Fuel: The horror episode, 'When Janet Killed Jonny', is full of this (even though the episode is played for laughs at the same time). Most of the creepiest moments involve Louise, who after being afflicted by the pub's curse, starts to saw off her own leg above the knee while being completely nonchalant about the whole thing, bashes herself in the head with a claw hammer, and then proceeds to saw her own head off.
What really makes this a Nightmare Fuel episode is that it's apparently not all just a dream. Well, yes it is, but not within the episode. It was also the last episode of the season, and Jonny's final appearance.
Also, the gore and monster effects were very realistic. Not at all the goofy fair you see in most "scary episodes" of sitcoms.