Have enjoyed these posts very much. I have a couple of ideas as why there is a difference, incidentally I'm British. British popular comedy evolved from theatre, music hall, seaside, panto etc and during WW2 became widespread through the radio, although very few stations and all national, so the whole country became atuned to the same jokes and themes. I suspect with the size of USA and consequent range of localised environments, each with thier own stations, there was more fragmentation. (Also no or less/limited advertising and advertisers 'influence'?).
{As an aside, maybe Britain has a more anarchic side too, hence the lampooning.}
TV took off later here and again far fewer channels. We have a different concept of language too, double entendres and visual landscapes based on words.
I have heard that american films are so popular in-non english speaking countries, because they are easy to follow and use simpler language. Visual rather than language cues etc.
I could list hundreds of comedies here, but am going to limit myself to one sketch by the " Ronnies, it's very old now, but a classic - 'Four candles'. Apart from the words; the absolute, total attention paid to setting, clothing and body language mark this out in a class of it's own.
Can't post link, but it is on youtube - 2 Ronnies, four candles - HD one is better
Apologies if have been excessively pedantic, but you know how it is........