When Sid is singing into the Dictaphone, he sings, "Are you just too far gone to hear?" but when he plays the song back, the Dictaphone plays, "Are you too much in love to hear?"
Number and configuration of empty beer bottles on Babe's kitchen table changes throughout scene.
Pepsi-Cola machine next to stairway in factory changes: In earlier scene, it is large unobstructed dispenser with lit sign on side; a few days later, when Babe and co-workers are lunching nearby, it is much smaller, with no side lighting and racks for empty bottles on side.
When the Annual Picnic is announced on the banner outside the Sleeptite Pajama Factory, it shows it as Thursday, 12th July. If you look carefully at the calendar in Sid Sorokin's office, you will see that the 12th is a Monday.
When viewed in slow motion, the knives Hines supposedly throws at Babe actually pop out from behind the board.
Right before Hinesie throws a knife at the wall or a desk, a barely perceptible notch can be seen on the surface exactly where the knife will land, indicating the knives were rigged to pop out from the back.
When Hines and Mabel are dancing their soft shoe shuffle in the factory during "I'll Never Be Jealous Again", they drop a rag in the aisle between the machines. When they return to the aisle a few moments later, the rag is gone.
The movie takes place in Cedar Rapids. Ohio. But during the company picnic scene, several palm trees are visible.