Jon is right about advert "volume". Trust me, I used to act for several local TV stations and I know how the complaints about this very feature were then dealt with. It is compression that does it.

Another pet peeve of mine is the care that they use when filming guitarists to AVOID giving you a recognisable shot of the headstock, so I spend half the programme going "Is it a - oh, no, wait, I'm sure I saw an M in the name - but the script gives the impression of... might it be...a ..."

And another is the trivial amount of research done for and knowledge displayed in "documentaries" in most cases.

Not to mention the grammar (or absence thereof) and glottal stops.

Oh, and films of car chases - world going past outside the window like a mad thing - cut to the speedometer showing merely 80 or 90 mph...