On film, O'Neill co-starred in the Amblin Entertainment film "Little Giants," along with Rick Moranis; starred with Nick Nolte in "Blue Chips;" and was featured in "Wayne's World" and "Wayne's World II." He has also appeared in "Cruising," "Dogs of War," "Disorganized Crime," "K-9," "Sibling Rivalry" and in the title role in "Dutch." Recently, O'Neill starred in the Tiffany Theater's production of David Mamet's play "Lakeboat."