After Basil ties (off camera) his ascot before breakfast, the tie's spots are showing. Immediately after, same scene, the tie has stripes. Then, in the third scene immediately following, the tie again shows spots.
Basil and Digges make loud noise to wake up the West household. Basil is about one-third the way up the stairs and Digges is below the staircase. The scene switches to some awakened people at the top of the stairs and then back to Basil and Digges. But now Digges is well up on the stairs and Basil is below the staircase.
When Basil goes to the window to see the New Year's revelers below, the window is slightly open. But, in the next shot from above and behind him, the window is closed.