Continuity mistake: Charlie Brown's Christmas tree is never the same. When we first see it, it has three branches. Later, when he's carrying it, it has four branches. Then, when he tries to decorate it and it flops over, it has six branches.
Continuity mistake: When the Pink Panther walks past the lion-skin rug after spraying perfume on himself, the stripes on the lion-skin rug change between shots. There is also a "$450.00" card on the rug that disappears in the next shot.