Towards the end when Elaine and Mr. Lipman call Newman who is "The Cleaner", Newman gets the milk glass and takes out the milk bottles but never fills the glass. Somehow milk just appears in the glass when he drinks it.
The muffin top the customer was eating was not torn off a muffin. It was smooth and baked on both sides, no tear mark from a stump.
No garbage dump would refuse to take the muffin stumps and the sanitation department would have no problem picking them up either.