At the beginning of “Housesitter” (1992), Steve Martin tells Dana Delany he’s had a crush on her since ninth grade. Given that he’s 10 years older than her in real life (and looks every minute of it), I immediately began to have issues with this film. But then the more age-appropriate Goldie Hawn came along in her tight jeans and fixed everything. Martin and Hawn are such pros, they took a hackneyed rom-com plot (little fib becomes big lie, hijinks ensue, people make speeches, mismatched couple finally realizes true love, gag, the end) and turn it into something entirely watchable.