I decided to see The Changeling because it was directed by Clint Eastwood, which for me signals a quality product. Considering he started off in the TV series Rawhide I'm always amazed how far he's come in his career. He doesn't seem to be slowing down as he hits his seventies, and as well as directing, composed the music for this film.
The plot is based on a true story which I didn't know anything about, so while watching it I found some of the scenarios far-fetched, although after I came home I checked and found the real story even more bizarre (according to Wikipedia, so take with a pinch of salt.) I'd actually like to see it again now, with the knowledge that it isn't "jumping the shark", and I could suspend my disbelief better!
I was happy with Angeline Jolie's performance in the lead, but was particularly impressed by John Malkovitch since he played a role that was outside his usual range (i.e. not evil or demented). Because he was an unusual casting choice for a good guy, I felt it added a certain depth that the character wouldn't have had otherwise. There were a couple of great scenes, such as the one at night-time in the chicken coop, which managed to convey the horror of the situation without just relying on gore; and the interview in the insane asylum which had its own horror. Thinking of it, they were both illustrating the impossibility of escape. One image that I found especially strong late in the film was a shot of Christine Collins grasping the bars of a prison door.
Something that I unequivacably liked was the colour scheme for the movie. The opening shot was a high-level city view in black and white, and then it came down to a street and picked up pigment. But the colours used throughout the film were the shades that were used to tint old postcards, and it really gave it a strong effect of the era.
And finally it passed the Bechdel Test which isn't something I search out films for, but is always a nice bonus.