The episode where Kathie Lee Gifford comes to South Park.Mr.Garrison plans to kill her.He then goes to Jimbo's gun shop and decides on a black gun with a wood finish.A few scenes later when Mr.Garrison is talking to Officer Barbrady you can see the finish is white or grey.Then when Mr.Garrison is in the book depository ready to shoot Kathie Lee you can see the finish is wood again.