Yes, I believe that one of the episodes I mentioned was "Dennis Runs Away", since it has something about Mr. Wilson going bowling. As for the Christmas episode, in that same season, there was one about Dennis snooping around for his gifts, but it didn't say anything about him playing Silent Night (on his bugle, by the way; not his drum) but that might be the same one anyway. Could have been that those were filmed at around the same time, either before the other episodes or during a time that Mrs. Wilson's real glasses were being fixed and she was wearing her spares in the interim. But it was strange that "Dennis Runs Away" wasn't shown with the rest of the episodes back when they were run daily on Nickelodeon. Perhaps they just didn't have a usable copy of it. The only time I remember seeing it was when it was run on a local station back in 1987.
By the way, looks as if Nickelodeon didn't run the shows chronologically. While the episode guide says that "Aunt Emma Visits The Wilsons" was the series finale, the one that Nickelodeon ran last before starting over again was "Lucky Rabbit's Foot". I wonder why?