When the priest comes to Dallas' apartment and Dallas opens the door, the priest says "Hello, Mr. Willis." Bruce Willis corrects him by saying, "Dallas".
If you watch with DVD with sub-Titles or the VHS with close captioning the preist says Wallis not Willis, it ain't a real slipup because as part of the character of the preist is that he is somewhat absent minded when around Leeloo.
And lets say he did say "Hello, Mr. Willis.", this could have been an egg, or an inside joke referring to Bruce's real name. Even if this were the case, why would this be a slip-up? I don't see why. I would see it as a small joke. In Last Action Hero, the boy in the film was in a video shop with Arnold Schwarzenegger's character (I think his name was Jack in this one) and they walked past a poster for Terminator 2. The makers of the film removed Schwarzenegger's name and replaced it with Sylvester Stallone sitting on the Harley and they put Stallone's real name there instead, making it look like Stallone was the star of T2 (because the boy was in Arnold's film anyway) and they also did that for the sake of a Hollywood joke.
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