Non-Stop Hitchcock

I just saw this movie for the first time, and I thought it was great! But while I was watching it I was seeing all these actors I have come to recognize, particularly from Alfred Hitchcock films. The one film this film has a whole slew of actors from is Hitchcock's "Sabotage", where we find John Loder (there he plays a Detective Sergeant (whatever that is), here he plays an Inspector (whatever that is), Desmond Tester (the kid in both films - Sabotage was 1936, Non-Stop New York is 1937), William Dewhurst (plays this guy who is part of the saboteurs who gives the saboteur (played by Oskar Homolka) the bird cage and the bomb, here he also plays someone connected with the bad guys), and Peter Bull (in Sabotage, another of the gang of bad guys, as in this movie. He was also the Russian in Dr. Strangelove). I also recognized the woman who was the aunt taking care of the kid from the movie "Night of the Demon", which isn't Hitchcock but I have heard it's screenplay was written by someone Hitch used a lot (Charles Bennett, who it just so happens, did the screenplay for Sabotage!). And the guy in this movie who plays the blackmailer (Frank Cellier), I recognized him but couldn't place him. Then I thought of it, yes, he was the sheriff in Hitchcock's The 39 Steps. And even the steward in this movie looked very familiar. I had to look it up but yes, he too was in The 39 Steps (his name is Jerry Verno)! Wow!