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.
Dude, Not Funny!: Enfield and Whitehouse have said they deeply regret the decision to incorporate references to the real life breakdown of Tony Blackburn's marriage into the Smashie and Nicey sketches, essentially pulling this trope on themselves.
Sequel Displacement: In a sense. Kevin The Teenager is really a sequel to the "Little Brother" series of sketches but, while anybody in the UK who watched comedy shows in the nineties will be able to quote Kevin and even imitate his mannerisms, very few of them will know that he evolved from the Little Brother character. (Unless, of course, they saw the sketch where the transformation occurred: at the exact moment he turned 13.)