"Michael Spillane was great and Jens [Berthal Askou] was better and Owain Tudur Jones has come back and done well," said Crook.
"They have given the gaffer [Paul Lambert] a nice headache."
Tudur Jones played for the first time since returning from a short loan spell with Yeovil Town.
The Canaries took the lead against the U's in the 21st minute when young striker Luke Daley scored on his return from injury.
They held the lead until two minutes from time when Colchester's leading scorer Kevin Lisbie levelled.
Crook said his side's first-half performance was like watching a computer game.
"The first half was like Play Station stuff at times. Some of the football was brilliant."
Crook also admitted his side, made up mainly with academy scholars, will learn a lot from there draw with a strong Colchester team.
"The only fault was we didn't bury them when we had the chance and they were always going to come back with the side they had out," he added.
The Canaries' first team face Yeovil in League One at the weekend.
Source: BBC Sport
Source: BBC Sport