When characters said Megan's first and last name out loud, they said "Megan Libby', but when her social media was shown up close with her engagement announcement post, the name on it was 'Megan Libson'.
Megan gets the afternoon off work and calls her friend to meet her for a drink. The friend asks Megan why she doesn't call her boyfriend Chris to do something with that afternoon, and Megan states that he's out of town. However, while having that drink with her friend, Megan gets a call from Chris, who's back home. Megan is not surprised. Given that timeline, she could have easily met him that afternoon.