Goofs

At 1:06, as Hirayama approaches bookstore on his bike, he is seen wearing running shoes and his sleeves rolled down. When he enters the bookstore, he's sleeves are rolled up which he rolls down. And he is wearing rain boots.

Hirayama's first response at tic-tac-toe is not at the same spot as when he picks up the game back later.

Hirayama's assistant puts the cassette in his girlfriend's bag without the box but she returns it with the original cassette box.

She probably took it as well.

Hirayama girlfriend was holding the case last before she picks her phone from her bag. She no longer has the case as she puts it away not where she got it from. Maybe she stuffed in her jacket.