EEs are typically a mix which includes at least one blue egg layer, allowing for blue or green egg laying chicks. Future generations can also include brown & "pink" (really a shade of pale brown) egg layers. If one of the chickens in the mix doesn't have a blue egg gene, it is unlikely to be an EE, it is just an interesting "barnyard mix".
Muffs and beards on chicks should be apparent when they hatch ~ they don't usually appear later.
EE's legs are typically green ~ but can be other colors. A lot of EE's hatch with chipmunk looking colors, but not all, I have some EEs that look very much like my pure Ameraucanas as they are 2/3 Ameruacana and 1/3 cuckoo Marans.
Three of my EE have a spangled russian orloff daddy and have yellow legs, beards & muffs and a pea comb. Two of them lay blue/green eggs and one lays a brown egg.