Why faces of the persons are not shown in tom and jerry show?
Simple everything is seen from the perspective of the characters the humans aren’t important so they are not show cause that would take focus from the pro/antagonist. In snoopy kids never really listen to their parents so it’s a droning sound in the background in Tom and Jerry the humans are merely the person who sets tom on jerry or the person tom gets a hiding from when he fails to catch jerry or whatever the person is just there for status and needs no definable personality or look so they don’t draw their faces. If humans were in Tom and Jerry regularly you would make an association with a character that they might decide to write off any second because they have no definable traits they can use them when and if they please meaning the only characters you think of are the small cast of regulars.