volume 4 questions
 

so i have been watching volume 4. In the episodes cowabunga shredhead and and invasion of the turtle snatchers. It looks like there was two different artist working on the episodes. Was there I mean in one seen you see the turtles like normal then the next there heads look two small and more mirage like. Same with april one seen she looks normal next more anime(?) looking. Any one else watch those episodes and notice the same thing? Whats going on here?

Several overseas animation studios worked on the show throughout its history.

Yeah, even as a kid I noticed that stuff. The way they move is kinda odd at times too.

The easiest way to tell is if there is a logo for "Murakami Wolf Dublin" at the end of the Credits instead of the usual MW Swenson logo. All but one of the Season 4 syndicated episodes had this logo (along with a number from Season 3). This indicates that the episode was animated in Dublin instead of Asia. Even Season 9 in Red Sky used a different animation studio than Seasons 8 and 10, and it really reflects the poorer design in that season compared to the other Red Sky seasons. I also notice more "still frames" in some of those episodes.