Niles knocks over the milk jug in the café; he is thrown a tea towel to mop it up and he starts doing so. Seconds later the towel has disappeared and the table is dry. In the next shot the table is wet again and the towel has reappeared.
The 'glockenspiel' clock is center of attention when it springs to life showing 11.45. A line later the clock is in shot again showing (apparently) 10.55 or so. When Frazier is admitted a few moments later it shows 11.20.
Frazier advises Niles and Maris to try couples therapy. He suggests a "Reichian group". Neither Wilhelm Reich nor Theodor Reik (a similar sounding name), two prominent twentieth century psychiatrists, made any contribution to or showed any interest in couples therapy. This mistake is also revealing because the writers frequently throw around psychotherapy terms and names of psychotherapists without regard to accuracy.