Meg should have played Susan and Lori should have played Lisa
Not that they didn't play their roles well, but looks-wise I think the casting should have been reversed. Lori Loughlin looks nothing like she could be a child of Tony Roberts and Tess Harper. But Meg Ryan could easily look like a daughter of Tess Harper. I love this movie but that always bugs me a bit.
Maybe they thought Lori played the innocent better while Meg was better as the sexy girl, but I'm sure Lori would have been just as believable as the naughty type, and Meg would have been fine as the good girl.
Oh well. Maybe Lisa and Susan were switched at birth, lol. Or Susan was adopted. 😀