piglet - when a shot goes from someone's eyes, to something else, then we are looking at what they are looking at. in the Grease example, he looks at her, and sees the whole of her - she looks round confused to her friends, then does the grinding a cigarette under her shoe. As it's the denouement at the end of a movie, we have a whole load of references to work this into.
In the science short, we just see him gazing at her shoes, which she is kindly parading in a similar style to a fashion model. No interaction with her face/persona at all.
It doesn't really matter how any individual interprets it - the people who made this film KNOW this. It is deliberate and planned. They are knowingly putting this onto film, to be released, and re-inforcing stereotypes.
If this had been a short film for race equality, showing a white person looking at a black person as they worked in the fields, picking cotton, then the black person went and sat in a house that was a stereotype of a field-hands house, and it had a catch phrase of 'housing, it's a black thing', no-one would see that as encouragement for african americans to buy housing & move into property ownership.
Even typing that paragraph makes me uncomfortable as it's so very obviously wrong to represent a group of people like that. But when it comes to teenage girls, that's OK, cos they're all pink & fluffy so we can treat them as sub human. Add a laugh sound-track and we all know it's fun, so let's not get our knickers in a twist, eh?