1. "Rocky and his Friends" came BEFORE "The Bullwinkle show, not the other way around as implied in one episode (I don't remember which).

2. Tom of "Tom and Jerry" DID occasionally speak, though not often enough for his voice to be well known or even consistent.
(I think the belief that he didn't was mentioned in "Take My Sister, Please." I know it was when Joey and Danny were competing for a lady's attention.)

Does anyone else know of any other mistakes made on this topic?

Take my Sister please is the one where Dannys Sister comes isnt it? The episode about the Tom and Jerry Thing was where Becky was goin through that Child Birth Class and the person teaching that class was the one Danny and Joey Liked.

The one where Danny's sister comes is "Too Much Monkey Business."

Sometimes it's hard to tell which episode is what because many episodes have a two or more plots, and most episode guides I've seen only list one plot. So I could be mistaken about which episode the childbirth instructor appeared in.

the episode in question is "take my sister please" because it is also the one where DJ demands to have her own room.