At 47 minutes: From an open upstairs window, Carol is watching Howard and Peggy arguing on the veranda, but when the camera position is changed to being on the veranda, looking up at the windows, none of the windows are open.
At 49 minutes: In the restaurant scene with Calvin and Murray, when the camera is pointing at Calvin at the table, initially in the background there are a couple of empty chairs at a table but after Murray calls Calvin by his first name, the camera switches back to Calvin and suddenly, there are a couple of people already dining at the previously empty table.