The Home Fries star, who plays best friends with Morgan in the film, is still baffled that the 30 Rock actor kept calling him the wrong name, according to WENN.
"We were together all day long... We'd been working together for two weeks at one point and it was the end of the day on Friday and I said, 'Tracy, I'll see you later. Have a good weekend'," Wilson explained.
"He looked over and I was in street clothes. I could tell he didn't recognise me - after two weeks. And I said, 'It's Luke'. He said, 'Have a good weekend, Lou'. He called me Lou."
The project, a remake of a 2007 British movie of the same name, revolves around a dysfunctional family which come together for the patriarch's funeral, only to be rocked by gay allegations from the deceased's alleged former lover.