I just watched two classic comedy shows on Cable - 1950's episodes of a Honeymooners and then a Jack Benny.
In the Honeymooners Ralph and Ed flip a coin to see who shoots first in a pool game then when that fails due to disagreements they go to Odds and Evens - sound familiar?
In Jack Benny - Jack is kidnapped - but not until he says ... "But I don't want to be kidnapped." just like Jerry's exclamations...
I don't see this as plagerism but could be results of studying the classic comedians in developing the show and Jerry's speach patterns. Benny was excellent with his speaking tone - in fact most of what he said was not funny except for how he said it.
It is clear Jerry studied the great comics he respected and he did pay homage to them in the show. It was interesting to see the roots of his comedy.