1) Perfect Pedro
Of all the Chelsea players that flopped last season, Pedro is the most reborn.
The Spain international looks well and truly back to his Barcelona best and deserved his first-half goal.
2) Nathan Ake is a future star
Many eyebrows were raised when Chelsea opted to recall Nathan Ake from Bournemouth earlier this month.
But the youngster looked classy and composed this afternoon and looks a huge prospect for the future.
Chelsea eased into the fifth round of the FA Cup with a comfortable win over Brentford
Chelsea did not need Diego Costa
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Non-league Sutton United had reason to celebrate in 1989 when they eliminated top flight Coventry in the third round thanks to goals from Tony Hains and Matthew Hanlan
3) No Costa no bother
You could have forgiven Brentford for thinking they had a chance to beat Chelsea when the teams were released.
But, despite their being no Diego Costa, the Blues cruised through to the fifth round without him. His replacement, Michy Batshuayi, bagged a penalty late on.
4) Farewell cameo?
With Chelsea cruising, Antonio Conte opted to bring on Branislav Ivanovic in the 64th minute.
It could well be the last time the Serbia international is seen at Stamford Bridge with the player reportedly in talks with Zenit St Petersburg over a move away. He rose to the occasion to get on the scoresheet to complete the rout.
Chelsea players celebrate Branislav Ivanovic's goal
5) Brentford are low on confidence
Brentford are currently sitting in 15th in the Championship table and any hopes of them beating Chelsea were evaporated within the first 45 minutes.