Moshe Ish-Kassit was a big, mild-looking man who inherited a Tel Aviv cafe where many cultural and entertainment figures hung out. They liked him and would occasionally cast him in a movie.
Yosef Shiloach was an Iranian-born actor with roles in dozens of movies, mostly Israeli but some American. He could (and did) successfully play serious historical figures, but he was bitter at having to accept many stereotyped roles as a bumbling, doltish Persian.
In this movie, Ish-Kassit in fact comes off better than Shiloach. Shiloach goes through his ridiculous schtick while Ish-Kassit with his limited abilities believably underplays what, for once in his career, is a leading role. Strangely, Shiloach is credited on screen as a co-writer although he professed to hating the kind of low comedy he performs here.
Assi Dayan the director (and writer, and third lead as actor here) was on the verge of giving up comedies, ten years after his classic crowd-pleaser Halfon Hill Doesn't Answer. Obviously he should have given them up sooner, because nothing in this movie is likely to put a smile on your face if you're over ten years old.
