After Isaac Clarke said "Who the fuck are you people?", I thought Robert Norton was about to say Lieutenant Frank Drebin, police squad, and don't let me catch you in America again. But he really does look like a younger version of Lesley Neilson though, from the Naked Gun, it's on netflix.
This is the same person who put up ( Robert Norton looks like a younger version of Leslie Neilson) but anyways I did see some pictures of Leslie Neilson, when he was younger but didn't look the same as Robert Norton. But I'm just trying to say that if there was another different younger version of Leslie Neilson, then I thought Robert Norton would've seemed like it.