When Alan and Charlie first sit down to drink their coffee in the coffee shop, Alan is shown picking up his cup and starting to lift it to his mouth.
The camera angle changes and Alan is shown reaching for his coffee and lifting it up to his mouth a second time.
While Alan is trying to put milk and sugar in his coffee, he misses with the milk and tries to clean it up. The camera lifts off of the milk until he tries to pour sugar in his coffee. When the table is seen again, there are no used napkins or much of a mess from the milk spill.
Alan asks Charlie why he would stop dating Sherri and he says he probably got bored with her.
However, previously in "Bad News From The Clinic", Charlie stopped dating Sherri because she was a self-centered, manipulative narcissist who easily dismisses him.