Visible crew/equipment: When Ruby is loading Viola's suitcases into the car, after staying at Charlie and Kevin's place, crew members are visible at the back of the car.
Continuity mistake: At the very first reception where Charlie helps her friend out catering, Charlie is carrying around a small platter of cheese balls to serve. The number of cheese balls changes in between shots and so does the color of the platter - from black to a lighter silver color.
Continuity mistake: When Charlie serves Viola the tripe dinner she is at the stove stirring something in a pot. When Viola passes out face down onto the tripe, Charlie covers the pan she is stirring, says goodnight to passed out Viola, shuts off the kitchen lights and goes to bed. The next morning when Ruby walks into the kitchen and sees Viola passed out in the tripe, the pot on the stove is gone.
Other mistake: Ruby tells Kevin to come back in spring when the flowers will be blooming but when they are walking outside all the flowers are already in bloom.
Continuity mistake: In the scene where Viola is lying on the couch and Ruby is handing her a Martini, Viola lifts her head with her hand to take a drink, in the very next shot her head is lifted but her hand is away from her head.
Answer: He was actually a waiter that Viola paid/bribed to pretend to be a doctor.
Torie White