Searching (III) (2018)
Very shortly afterwards, she is seen playing a tune on, yes, a cheap home keyboard, with the soundtrack following her - badly. The notes she plays are completely different than the soundtrack.
Errors in geography
David also reaches Margot's tumblr page from clicking the "Log In" search result suggesting she was already logged into the account on her computer but in that case, it would have taken him to her dashboard, not her blog and also would not have had an option to "Follow" in the upper right corner.