I watched the remake not too long ago, that wasn't a great film. This earlier version with Goldie Hawn and Kurt Russell is worse still, but not by much. It's a sappy romcom with slightly annoying leads, a very predictable plot and no redeeming aesthetic qualities, but it's also not as bad as it could've been.
Joanna is a wealthy woman who acts like a spoiled brat. After a spat with a carpenter, she gets into an accident and loses her memory. To get back at her, the carpenter picks up her, pretending to be her husband. Joanna ends up with him, cleaning his house and taking care of his kids.
Hawn and Russell have no chemistry, most of the characters are unlikable, and a near 2-hour runtime is well excessive for a simple flick like this. The pacing is somewhat decent though and while there are no laugh-out-loud moments, the vibe is pretty light and agreeable. Overall though, very forgettable.