The credits for this episode didn't credit Rob Paulsen, Mark Hamill, and Pamela Segal-Adlon as providing the voices for their elderly doppelgangers on "Old Timers' Squad".
Guy:I'm going to be a bit late to dinner!
*By the time the message reaches his mom*
Guy:You got a message from your son saying that you have a giant butt.
from "Old Timers' Squad":
Otto: Hey, wait a minute! Is *this* as big as I get?
Old Otto: You ain't never gonna make the basketball all-stars that's for sure. Heh-heh-heh. (coughs)
from "Day of the Larrys" Real Larry: Happy birthday! Copy Larry: It's my birthday? What did you get me? Real Larry: A list of chores! [holds out a slip of paper that unfolds into a long strip]
This is like a RPO episode when Rolie made a clone of himself so he doesn't have to do his homework and watch TV.
This aired the same day as the Spongebob Squarepants Lost Episode.
The plot to Day of the Larrys is similar to the movie "Multiplicity" where an everyman gets cloned (or at least the episode of "The Simpsons" where Homer buys a hammock that makes clones of himself).
Larry telling his first clone "Happy Birthday" is a reference to Frosty The Snowman, who says Happy Birthday every time he comes to life.