Nagata, the main character, watches a theater play, that is named "Little Alice".
Kenta Yamazaki is the main character in Netflix' show "Alice in Borderland", where he plays Arisu(Alice).
Saki and Nagata have a date, where they pick alcoholic drinks. Kento Yamazaki who plays Nagata picks Yamazaki, which is not only a whiskey, but also his last name.