To find out how to plan theirs. But no one recognized them there. Everyone knows one another on the island but not a pilot who runs a small airliners on the only small airport on the island where people come and go frequently. And the lunch counter lady, It was established that Joe was very well known too. Helen has lived ther all her life as well. Just a minor goof.
---
Helen moved to the island when she was 10. But I see your point. I think its one of those things that could only happen in a sit com.
"Life is like a box of Krispy Kreme donuts".
Just watched that episode again. The other unrealistic thing was that Joe was using the seating card of the groom's best friend. So where the heck was this "best friend"? He didn't show up for the wedding and he didn't RSVP?? Some friend! ha!
And when the bandleader announced that the groom's best friend was giving a toast, you'd think at least the GROOM would've noticed! I know what my best friend looks like.