“Amy’s Choice” was notable for sorting out Amy’s feelings for the Doctor and Rory – a subject under fairly close scrutiny following her attempted seduction at the end of “Flesh and Stone.”
Fans have become almost inured to the Doctor snogging his companions these days, but in the old days that sort of thing was never done (well, not until the Eighth Doctor’s TV movie, at least). In fact, it was sort of becoming old hat: “When will the Doctor kiss this companion?” But Amy’s full-on seduction bid was something new, and it had to be addressed. Was she really willing to be with another man (well, Time Lord) on the night before her wedding? (This sort of thing is done all the time on daytime soap operas, but for DOCTOR WHO it’s something new.) Recall that one of the running gags during season four was people assuming the Doctor and redheaded Donna were married. Well, in typical “Don’t know what you’ve got til it’s gone” fashion, it took Rory dying for Amy to realize that she really does love him. Fortunately, the Doctor has a time machine; unfortunately, that time machine was invaded by entity known as the Dream Lord.