Ozone depletion doesn't cause global warming. What causes it is more carbon dioxide being put into the atmosphere by the burning of fossil fuels. The only thing ozone depletion does is that it allows more harmful ultraviolet radiation to get to the Earth's surface.
When the airplane pilot said, "If you look on your left, you will see the hole in the ozone." the ozone was really on Courage's right.
They used the wrong ending sequence. "Dog, prepare to meet your doom!" was not in "Snowman's Revenge," but in "The Snowman Cometh."
Snowman: (playing Old Maid with a frozen Eustace and Muriel) Come on! When you had the Old Maid I picked it from you. Now you have to pick it from me. Snowman does not want to be the Old Maid!
Cow: (Courage brings it to the plants) Hee, hee, hee.
Cow: (Now a skeleton) Hee, hee, hee.
Eustace: Where's my pants?
Snowman: (Referring to Courage, Muriel, & Eustace) You have become... like family to me!
This is another episode where we find out Nowhere is in the middle of Kansas.
When the Snowman was thinking up some names for C, M, & E, one of the names he mentioned was "Slush Puppies." Slush Puppies is a company that makes fruit flavored slushes.
The snow people are actually the same that were on the pictures in "The Snowman Cometh."
The pilot in the airplane said he was Captain John Dilworth.
The Snowman Song (You Freeze Up My Life):
I'm feelin' fine just because you're mine,
life is like a song, since you came along,
You freeze up life!
Life is nice, sugar and ice,
and all because of yooou!
Hey, hey, hey, hey, hey
Everyday's a thrill, all I want to do is chill,
My loneliness is lost, my frosting's turned to frost,
You freeze up my life!
Life is sweet, strawberry sweet
like one big snow day!
(a couple seconds instrumental)