Quoted from tkitna

Checking Out (1989) (uncredited) .... Cleaner
Shanghai Surprise (1986) .... Night Club Singer
Life of Brian (1979) (uncredited) .... Mr. Papadopolous
... aka Monty Python's Life of Brian (UK: complete title)
The Rutles (1978 ) (TV) .... The Interviewer

There are more examples:
Water (1985)
He appears at the very end of the film as a part of an all-star playing at the United Natinos, along with Ringo Starr and Eric Clapton.

and more...
Some more info about "George at the movies":

Wonderwall (1969), directed by Joe Mussot. Hari: music.
Raga (1971, Apple Films). Documentary. Hari: production (with Ravi Shankar), seldom appearances.
Messenger out of the East (1971?? ). Documentary. Hari: production (with Ravi Shankar).
The Concert for Bangla Desh (1972, 20th Century Fox), directed by Saul Swimmer. Documentary. Hari: it's understood =)
Imagine (1972, Joko Production). Documentary. Hari: seldom appears
Little Malcolm and His Struggle Against the Eunuchs (1974, Apple Films). Hari: Executive Producer.
All You Need Is Cash [on video under the name The Rutles] (1978 ). Hari: a tiny part.
Life of Brian (1979, HandMade Films). Hari: production (with Monthy Python), and, again, a tiny part.
The Long Good Friday (1981, HandMade Films). Hari: Executive Producer.
Time Bandits (1981, HandMade Films). Hari: Executive Producer, co-author of the script, music ("Dream Away").
Monty Python Live at the Hollywood Bowl (1982, HandMade Films). Ducumentary. Hari: Executive Producer.
The Missionary (1982, HandMade Films). Hari: Executive Producer.
Privates on Parade (1982, HandMade Films). Hari: Executive Producer.
Scrubbers (1982, HandMade Films). Hari: Executive Producer.
Bullshot (1982, HandMade Films). Hari: Executive Producer, back vocals on one song (by "Legs" Larry Smith) from the soundtrack.
A Private Function (1984, HandMade Films). Hari: Executive Producer.
Water (1985, HandMade Films). Hari: Executive Producer, also takes part on the soundtrack: guitar on "Freedom", co-author of "Focus of Attention", co-author of "Celebration" appears at the very end of the film as a part of an all-star band playing at the United Nations, alon with Ringo Starr and Eric Clapton
A Sense of Freedom (1985, HandMade Film). Hari: Executive Producer.
Porky's Revenge (1985, HandMade Film). Hari: Executive Producer, lead vocal on Dylan's "I Don't Want to Do It".
Shanghai Surprise (1986, HandMade Film). Hari: Executive Producer, also on soundtrack: author on all (?) tracks, vocals, has a part listed in end captions as a "nightclub singer"...
Mona Lisa (1986, HandMade Film). Hari: Executive Producer.
Bellman and True (1987, HandMade Film). Hari: Executive Producer
Withnail & I (1987, HandMade Film). Hari: Executive Producer, also on soundtrack: on White album bversion of WMGGW - that is the only Hari participance...
5 Corners (1987, HandMade Film). Hari: Executive Producer, also on soundtrack: ?
Track 29 (1988, HandMade Film). Hari: Executive Producer.
The Lonely Passion of Judith Hearne (1988, HandMade Film). Hari: Executive Producer, also on soundtrack: ?
The Raggedy Rawney (1988, HandMade Film). Hari: Executive Producer, also on soundtrack: ?
Checking out (1988, HandMade Film). Hari: Executive Producer, also played the part of an charman, who was sweeping rubbish away from Paradise.
How to Get Ahead in Advertising (1988, HandMade Film). Hari: Executive Producer, also on soundtrack: ?
Pow Wow Highway (1989, HandMade Film). Hari: Executive Producer.
Lethal Weapon II (1989). Hari: co-author of "Cheer Down".
Nuns on the Run (1990, HandMade Film). Hari: Executive Producer, also on soundtrack: "Blow Away" on soundtrack.. Everest (1998 ). Hari: Composer