When the heavenly whippet looks in Charlie's records, his mother and father are named "Loni" and "Burt", and look like canine versions of Loni Anderson and Burt Reynolds (who were together at the time.) Loni also appears in the film as one of Charlie's "close friends".
Executive Meddling: We were originally going to get to see Charlie's body flying off the pier (a rare example of a meddling executive making a good call). Interestingly, many book adaptations of Don Bluth films include unused artwork; ergo, the tie-in book for this film showed a very clear silhouette of Charlie's body flying alongside the car...
Bluth also claimed that he was locked out of most of the recording sessions for the actors.
Troubled Production: The sequel, according to the directors, was originally animated in Dublin, Ireland (where Bluth's original studio, which produced the first film, used to take place before that). But then, after Screen Animation Ireland, the Dublin studio in charge of the animation, shut its doors, the animation has to be outsourced to several studios in countries like Taiwan, Korea, Canada, and Denmark in order for the film to meet up the deadline.
Charlie was a detective in the original draft and the film was going to be an anthology of three short stories.
The Hell sequence was supposed to be a lot longer than it was in the movie.
In Don Bluth's book The Art Of Animation, he claimed that Burt Reynolds, a foreigner to animation, originally wanted to give Charlie a broad, cartoonie voice. Bluth replied "We hired Burt Reynolds to do Burt Reynolds, not Scooby-Doo."