When Homer was kicked out of the house it is unknown why he didn't go and stay in a motel or go to stay with his father. A possible reason might be that the motels were all full or Abe was on with the other residences of Springfield Retirement Castle. Insteads in this he stays in Bart's treehouse.
This episode really made Simpson fans think Marge and Homer were going to get a divorce.
In Homer's rant to Marge while in their bedroom, he says this:
"Look Marge, you don't know what it's like. I'm the one out there every day putting his ass on the line. And I'm not out of order! You're out of order. The whole freaking system is out of order. You want the truth? You want the truth?! You can't handle the truth! 'Cause when you reach over and put your hand into a pile of goo that was your best friend's face, you'll know what to do! Forget it, Marge, it's Chinatown."