Harvey didn't stay seated. Watch the clip. See him have a musical lark in the park.
Harvey recreated his dance role for the production number when that Best Song nominee was performed during the Oscars. Most of the people in the audience, probably millions of TV viewers, didn't know that they'd grown up watching Harvey's early dance work. He was younger and still in the same part of Manhattan. Look at the bottom corner on the right side of the photo below. That's Harve against the chain link fence.
But that salute can include Enchanted -- also featuring Harvey Evans.
The Oscars® air Sunday, Feb. 24th on ABC.