At the end when Edwina is dancing, she puts her feet on top of Roger's. She is wearing ballet type slippers. When Edwina and Roger are dancing a few second later, Edwina is wearing high heel shoes.
Roger has a watch on when he arrives at Edwina's wake but loses it when he falls asleep. When Terry wakes him up, he has to ask her what time it is. He gets it back in the next scene, however, when he and Terry get in bed.
After Edwina enters Roger's body and they use the bathroom for the first time, there are stalls behind Edwina. Behind Roger there is a wall. The same thing should be seen since he's looking into a mirror.
When Edwina (through Roger) declares that Terry needs a spanking and she happily consents, her derriere is already red from previous takes.
Several of the backgrounds while Roger and Edwina are talking into the mirror do not match. They should be identical.
When Edwina's spirit first goes into Roger's body, she has the ability to move his right leg (to walk and so forth). Yet, throughout much of the rest of time she's in him, he's able to walk fine as if Edwina suddenly loses the control.