(at around 36 mins) While Allison and the landlady are having coffee, the coffee cup is in the landlady's hand, then when the camera changes angles it's on the table, then back in her hand when the camera angle goes back.
(at around 4 mins) In an opening scene in which Cristina Raines' character is filming a shampoo commercial, she and another model are seen whipping their hair around. The footage was reversed, so the actresses' hair is moving backwards.
Were those really Human Oddities (Freaks) in the climax?
Yes. Michael Winner's casting assistants made scouting throughout several carnivals to find people of these characteristics willing to participate in the film.
Was Cristina Raines actually a fashion model?
Yes. Cristina Raines was a runway and photography model during the early '70s, before her acting career became her main occupation. Nowadays, she's semiretired, as she is married to Christopher Crowe and both have raised a family.