Hudson-Odoi replaced Chelsea summer signing Timo Werner at half-time on Saturday and provided the assist for Tammy Abraham’s consolation goal.
Frank Lampard’s side slipped to their third defeat from four games as Arsenal clinched a surprise 3-1 win to put an end to their shocking run.
Mount was critical of Chelsea’s performance in north London but said Hudson-Odoi provided the Blues with at least one positive.
‘We all know what Callum can do and he came on and brought that spark,’ Mount told Chelsea’s official website.
‘He’s very good one on one and we just have to get him the ball going one on one and try to create chances.
‘He did very well when he came on and that is something he can take away from the game.’
Mount added: ‘It is something where we need to look at ourselves as players,’ he says. We didn’t start the game anywhere near what we should be.
‘We are representing Chelsea, we’re a big club and we really need to look at ourselves as players and say that was not good enough.
‘We know that, it is a big London derby and we need to start the game way better than we did. We have to be harsh on ourselves.
Chelsea’s defeat see them slip to seventh in the Premier League, six points behind Liverpool who have a game in hand.
Lampard’s side face in-form Aston Villa on Monday and Mount has urged his team-mates to respond.
‘We are big players so we can get together and really bounce back after that performance,’ he said.
‘It is probably better we have that quick turnaround because now we look at another game.
‘The Arsenal one is gone, there are still big things we need to work on but now we have that one day before our next game and we can put it in the back of our heads and really go into Villa with a strong mindset, starting the game very well and hopefully doing well in the game.’