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.
Not to mention, the hallucination scene at the beginning of Episode 3. Though, this was the inspiration for Shaun of the Dead to begin with.
A real-life example, but with regards to the use of Star Wars during 'Chaos', the team actually wanted to use the series' proper soundtrack for the background, and had petitioned Lucasfilm to use it in the show. Lucasfilm, being protective of the license, told them 'no', only to begin to change their minds once they understood that the characters were not using the series as a source of mockery. They then agreed to allow the team to use elements from the series - there was just one problem; By the time Lucasfilm had agreed, the much contested prequel Episode I had been released. Rather than use the material Lucasfilm would now allow, the team instead stuck a three good Star Wars films later jab into 'Chaos' at the last minute, and proceeded to make the dissatisfaction with Episode I an element of Tim's character in Series 2.
Seinfeld Is Unfunny: Widely praised and practically worshiped by comedy nerds, a decade later the series can feel light and underwhelming to newcomers finding it via Shaun of the Dead and Hot Fuzz (especially if they're not huge fans of film able to catch many of the references). However, as one of the first shows to create a Simpsons-like cartoon reality within a live-action show, it was groundbreaking at the time, and it influenced a number of creators of American comedy to follow its example to new extremes (thus making Spaced seem shallow by comparison).
Tear Jerker: When Daisy confesses to Marsha that she and Tim aren't really a couple - and that ''everyone else knows - the look on Marsha's face is heartbreaking.
Particularly when she reveals that the 'couple' requirement on the ad was the result of a miscommunication between her and the man writing the advert, and she'd have been perfectly happy to have them both there anyway.
The use of VCRs and VHS (especially noticeable for their use for porn), the knowledge of the existence of the internet but the lack of it in Tim and Daisy's flat (not yet easily affordable or worth paying for) - also, the old trope of kids getting their first porn from magazines abandoned by others.
The presence of mobile phones, but only as a symbol of wealth/importance/success (Duane and Damian Knox have mobiles, Tim and Daisy only use the landline in their flat or payphones, Brian only uses one whilst pretending to be a lawyer).
The use of Polaroid cameras; little background things like Pokémon merchandise in the comic book store, with an "Ancient Mew" card clearly visible under the counter and advertisements for bands such as Coldplay and Muse playing smaller venues than they would today.
Sometimes the old-fashioned-ness is intentional, for instance when Daisy hefts a massive, outdated camcorder and smugly says, 'Welcome to the 21st Century'. Daisy and (less so) Tim are skint and out of touch with ACTUAL youth enough to be using technologies and listening to music that Amber and her friends would disdain.
Daisy uses a typewriter and not a laptop.
Though even the typewriter she's using is an antique by the standards of the day. It's meant to show that she's really not putting much effort into being a writer. If she was she'd have a more modern electric typewriter or a word processor
And also that she's a wannabe hipster. She wears glassless glasses when using the typewriter after all.
Characters seen smoking in indoor locations (smoking in pretty much anywhere but private residences and the street was banned in the UK in 2007, certainly in pubs).
Daisy and Tim pay Ł90 per week to rent a flat in North London; even by the time they were they pre-screening it for test audiences, that had become a pipe dream. In the DVD Commentary, Pegg says it got the first laugh of the series.