Normal people living in an apartment big enough to be a sound stage?
Medical issues in an American show where no one seems worried about how to afford the care?
People being clever and quippy through an entire conversation? Especially without seeming like a prick? And with long pauses where editors can put in a laugh track?
Similarly, people making highly self-aware expressions of their feelings, especially at work or in public?
Every person in some organization being fit and attractive?
Technology working perfectly and requiring only 1~3 seconds to do anything, unless the plot calls for it to dramatically fail?
People starting a sentence, going somewhere else, and then finishing the sentence?