This episode was taped on April 14, 1989.
Marcy mentions that she and Al have been neighbors for 937 days. This episode was taped on April 14, 1989, which was 855 days after the pilot episode (December 12, 1986). The only logical explanation can be that the writers based their ballpark figure of 937 on the actual day that Ed O'Neill and Amanda Bearse first met before rehearsal began.