Are the events from the movie Batman: Mask of the Phantasm considered to be taking place in the universe depicted in Batman: the Animated Series or the two things just have the same "look and feel"? (I mean, is a film merely based on the show but that does not expand nor alter the universe of the show).
I will accept any references to the Phantasm, Andrea, or any other characters or events first seen on the movie and then seen in the Animated Series as proof of it. Any other explanation of why it is so (or why not) is of course welcome. I also understand that there may be "lack of evidence", but I hope that somebody can point to something in any of the series' 85 episodes that will proof one thing or the other.