Other mistake: The apartment is technically supposed to be right over Jack's bistro (a lone apartment by itself), but whenever the front door is open, there are other apartments and a presumed hallway showing. Also, if this IS supposedly the only apartment over the bistro, how is it that it is a completely different looking apartment than the original one shown in the Three's Company episode where Jack caught Mr. Angelino attempting to cheat on his wife?
A Case of Sour Grapes - S1-E14
Other mistake: There is a sour bottle of wine that Jack and EZ taste in the kitchen - Jack throws the bottle in the sink and breaks it before Vicky and Mr. Bradford enter the kitchen and have a chance to taste it. There would be a strong sour smell all over the kitchen, but no-one in the room noticed any bad smell after the bottle of wine breaking.