Homer's Weight

Early on in "Brush With Greatness", several signs of Homer needing to lose weight start to show up, such as his swimming trunks' smiley face turning into a frowny one and his stomach honking the car's horn. Later on, he gets stuck in the H2WHOA! water slide, with eyewitnesses estimating his weight at somewhere between 400 and 500 pounds.

Example of:
Foreshadowing