Now I'm pretty sure everyone knows what Gretzky went on to accomplish in hockey. I have no idea whatever happened to Brian Croley, but he never played any significant level of hockey after that.
Len Hachborn, who often got to play with Gretzky growing up, did follow The Great One to the National Hockey League. After being passed over in the 1980 NHL draft, the Philadelphia Flyers drafted him 184th overall in 1981.
By 1983-84 he finished the season with the Flyers, scoring 11 goals and 32 points in 38 games - impressive numbers indeed. It earned him another half season in 1984-85, though his scoring tailed off. A separated shoulder certainly did not help matters.
The Flyers discarded Hachborn out to Los Angeles after that. He ended up playing 24 more games in the NHL with the Kings, bringing his totals to 102 games, 20 goals, 39 assists and 59 points.
Hachborn bounced around the low minor leagues and Europe for a long time after that. How long? He retired from hockey in 2001 - 2 years after Wayne Gretzky did.