George (Jason Alexander) grabs Jerry (Jerry Seinfeld) as he walks away in the opening scene. Jerry's scarf is draped over his shoulder, but in the next shot it is fixed. Cut back again, and the scarf is back on the shoulder.
During the airport scene, Jerry's (Jerry Seinfeld) collar is tucked underneath his coat. When we again see him, after George (Jason Alexander) says, "they can't kill us," the collar has been straightened.
When Eva (Suzanne Snyder) takes a gun, Jerry (Jerry Seinfeld) says: "Nice Luger". However, the gun Eva takes is not a Luger.
Despite Jerry's (Jerry Seinfeld) observation, the pistol Eva (Suzanne Snyder) selects from the gun case is not a Luger, although a Luger is visible in the assortment. Though probably a prop error, it's more likely that Jerry simply isn't the foremost authority on the subject.