#1 Frank Lampard's substitutions didn't work
During the second half, it was quite clear that Bournemouth were creating the better chances and looked more likely to score the opener. Some of the Chelsea players were just passengers and it was evident that something had to change.
So, after the 60th-minute mark, Frank Lampard brought on Callum Hudson-Odoi and Mateo Kovacic for Christian Pulisic and Willian, but both of them had little to no impact on the proceedings of the game.
Hudson-Odoi even gave the ball away in his own box just after coming on but Chelsea escaped after Josh King couldn't find Dan Gosling for a tap in. Then, Lampard brought on Michy Batshuayi for Jorginho but due to the lack of service, the Belgian striker never really threatened Bournemouth's backline.
To many people's surprise, Mason Mount, who remained anonymous through large portions of the game wasn't brought off and one can say, the young Englishman had his worst game in a Chelsea shirt. Chelsea have now lost four of their last five Premier League games and it's now up to Lampard to rejuvenate his team.