Is it just me or is LF's neck considerably longer in LBT 7 in comparison to LBT 8?
Anyway, nice topic
lol it's something every LBT sequel has faced. Inconsistencies between frames is somewhat common in the sequels. Also, I sometimes think the layout artists were half-awake because some characters can be overly-huge or small in various scenes throughout all of LBT series.
If you see this screen from LBT 7, look how much shorter his neck is lol (EDIT: Compared to the first LBT 7 image I posted)

And converse to how it may seem, throughout LBT 7, Littlefoot doesn't really have a big white reflective spot on his eye, yet despite the pic of LBT 5 I posted, Littlefoot really has a lot bigger white spots in that sequel than he does others. It all depends on the scenes really lol.
If you rewatch LBT 7 or 8 you'll see parts where Littlefoot really looks good and enhanced compared to some previous sequels, while in other places it's like "what?" lol