The first one that jumps to my mind in Hooper (with Burt Reynolds) in 1978. I thought of it the minute I read your question but I am not sure that it is the first.
"W. McCarthy" <[log in to unmask]> wrote:
Would someone be kind enough to tell me (or to speculate on) which
was the first Hollywood-type film that incorporated into its
conclusion takes containing various sorts of errors (flubbed lines,
in the main)?