Slaters poignant, career-shifting performance is reminiscent of Burt Reynolds inBoogie Nights.
But another unexpected reference point was in the actors head while on the set.
And it slipped out a couple of times.

I just found out that theres an outtake now where I did a full-on Ethel Merman impression.
Maybe itll be on the bonus reel, Slater says.
That was full-on improv.
And I had that song somewhere, easily accessible, in my brain.
And really, I felt like Mama Rose and he felt like Gypsy Rose Lee.
And I was excited and he was my star.
So I was just like, oh well, Youll be swell, youll be great!
Gonna have the whole world on a plate!
Everything is coming up roses!
So youll have to wait for the Blu-ray release to potentially see Slater belt out that tune.
Check out forKing Cobrabelow.
The film is in theaters andavailable on demand now.