The pioneer era: I think the pioneer era takes place after pest of the west and the mr krabs lookalike was actually pappy krabs son and the plankton lookalike was deadeye planktons son and sheriff pants was spongebucks son and deputy star was pecos Patrick’s son so yeah assuming dopey dick takes place before pest of the west that makes sheriff pants spongehabs grandson and sheriff pants became a sheriff because his father was and he took his fathers role as a sheriff but yeah Patrick saying the krusty creamery being the first restaurant contradicts dopey dick and pest of the west I’m just gonna say in universe he didn’t say first he said some other number idk
Industrial Revolution era: the SpongeBob and Patrick lookalikes were SpongeBob and Patrick’s imagination but I think it actually used to be SpongeBob and Patrick’s dads working there at one point
The other eras: idk yet