Baseball bats in English shows? It’s called the continuity director not doing his/her job. This person is in charge of making sure nothing out of place or era is in the show.
I was watching a MASH rerun the other night. I noticed there was a Spin A Card pinball machine in the background. The Korean War was early 50’s. Spin A Card was made in 1969.
After gun control in the UK knives and cricket bats are the weapons of choice.