The Murdock's home has the same floor-plan as the Cleaver house from seasons 1 and 2.
This is both Jennie Lynn and Rory Stevens's fourth and final appearance in the series and the only time they play brother and sister. In each of her appearances, Jennie Lynn played a different character. Rory Stevens was Chuckie Murdock in all but his first appearance.
Beaver (Jerry Mathers) tells Patti (Jennie Lynn) that he is twelve, when in real life he was almost fourteen. Patti tells Beaver that she is ten, and in real life, according to her page on this site, she was also ten.