Chelsea fans have praised defender Reece James after the youngster made a huge impact on his first start for the Blues in the league.
"I'm proud of them and I believe in them", he told BT Sport after the match.
In between, the lively Pulisic also saw an effort well smothered by Guaita after a classy run while Reece James, who was preferred at right-back to the dropped Cesar Azpilicueta, sent in several unsafe crosses.
"Every team has players that can hurt you on the counterattack, Zaha is one of the best, but could we hurt them the other way?" "We've put in a lot of good performances, away from home and again today at home". Could we make him run back more than he ran forward?
"I trust in Reece defensively so really, really impressive game for him and he's going to get much better". He broke the deadlock soon after. His goal was the fifth in the Premier League, all in his last three games, and already the most he has scored in five league seasons in Europe.
Mateo Kovacic's dribble and pass in an all-star performance found Willian, whose deft touch left Abraham one-on-one to beat Vicente Guaita.
Pulisic, who has now scored five goals in Chelsea's last three Premier League games, wrapped up the victory with his 79th-minute strike, heading in after substitute Michy Batshuayi's blocked shot bounced up for the United States worldwide.
Mount has been key for the Blues since returning from Derby County and has been at the centre of Lampard's young Chelsea side.
Palace's defense survived a Chelsea onslaught at Stamford Bridge in the first half - the Blues recording 11 shots to zero for Palace at the break.
They will now head into the worldwide break on a high and, after proving he is just the latest member of the squad who can play at Premier League level, James may even dislodge Azpilicueta as Chelsea's first-choice right-back before the season is up.