Hi to your problems
@speechbubble reset
@zoom reset
but - they have absolutely nothing to do with character animation anyway. 
If your character makes on a start of a new chapter some unwanted animation it is most likely because this was the last animation he was doing in the previous chapter.
To solve it simply make him do animation you want time to make right from the start of a new scene.
- The background
you might be zoomed out - then you can see black line above or under the background.
zoom stays till you end it through all episode so try to add
@zoom reset under the new background which makes this problem.