When Martin enters Frasier's apartment, his hair is wet from the rain. When Niles enters a few minutes later, his hair is completely dry.
At 1:05, Frasier moves his left hand to his lap from the brochure. The next shot his hand is still on the brochure. The following shot his hand is in his lap.
When Eddie shakes himself off from the rain, the closeup of him doing so shows water droplets on the floor. In the following long shot, the water is no longer there.
When the waiter throws a drink over Niles, Roz (Peri Gilpin) is clearly corpsing in the background and has to cover her face.