Are these sentences gramatically correct?

I have to write a script for an interview in Japanese, and I'm doing it with Hayao Miyazaki (Studio Ghibli director)
Do these make sense?

ごしつもんしてもよろしいですか。　- Can I ask some questions?
この えいが を み た こと ある - Have you seen the movie (having already mentioned the movie, meaning I use kono, not sono, right?)

Thankyou!!

Are you going to do the interview with him?? In Japanese?
If that is the case, um, how polite/respectful would you want your questions to be?

This is the minimum polite sentences.
しつもんを　しても　よろしいですか。
この　えいがを　みたことは　ありますか。

One step more “respectful”:
おうかがいしたいことが　あるのですが、よろしいですか。 (I have something I would like ask you, may i? with a humble expression for the verb “ask”)
この　えいがを　ごらんになったことは　ありますか。(Have you seen… with a respectful expression for the verb “see”)

I always use https://essaytoolbox.com/grammar-checker to check my sentences. Try it, it is free.