The other two studios added to Ren & Stimpy in season 4 were Mr. Big (from Australia) and Toon-Us-In (Korea, and I think they had an office in LA as well, similar to Rough Draft). While Mr. Big could be hit or miss, usually miss, I thought Toon-Us-In was just as good as Rough Draft. In fact, I often wouldn't be able to tell them apart until I read the credits. But back to TTA. Well, anything involving great detail, like the explosions you mentioned, do tend to have that "look" to them, because as we all know, Japanese animation has attention to detail. Other than that, I never really got an "anime" vibe from their episodes. I think it's because the staff at TMS really knew how to do cartoony, so it wasn't limited animation when characters are talking (a common trait in TV anime), for example.