I know most find it confusing, and likely think it's a stupid idea, not that I really care since I don't really get along with anyone.
I put stuff into different earths since in the case of lbt the feel of the movies are different and there are some things that do not fit, though I don't notice many inaccuracies. I put it into different earths, the idea I got from pre crises dc comics where things on earth 2 are similar to earth 1 but there are some differences.
Lbt earth 1 is the first movie, even the early sequels do not have the same exact feel so those I put on lbt earth 2. They are mainly series with some comedy, but not the same feel as the first movie. lbt earth 3 is more comedy and the gang are never really in any real danger or if they are by sharpteeth they are very easily evaded or gotten rid of. Lbt earth 4 would be through the eyes of a Spiketail where Spike can't understand much of what the others say, when they've shown in movies and other episodes that Spike can understand what the others are saying based on some facial expressions and his nodding or something when someone asks him a direct question.
The events in the movie happened in 2-4, but the exact details were likely different. The sharptooth in the first movie in earth 2 would be much the same danger, but in 3 he'd have been evaded more easily or gotten rid of earlier in the movie. I know most disagree and think it's stupid but I don't really care. It's just the way I mentally classify certain things. Like space 1999 season 1 and 2, 2 different universes.