Characters portrayed by O'Donnell in the Batman Universe
- Bob Kane didn't like or understand that Joel Schumacher wanted O'Donnell to wear an earring. Kane also disliked the nipples on the costumes.
- O'Donnell reportedly was part of a field of candidates for Robin that included Leonardo DiCaprio, Matt Damon, Jude Law, Ewan McGregor, Corey Haim, Corey Feldman, Toby Stephens, and Scott Speedman. Producers narrowed their choices to DiCaprio and O'Donnell. At a comic book convention, they asked a group of 11-year-old boys, the target audience, which actor could win a fistfight. After the boys overwhelmingly declared O'Donnell the winner, he was ultimately given the role.
- O'Donnell featured prominently in the TNT miniseries The Company alongside former Batman actor Michael Keaton.
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