star Reginald VelJohnson will forever be remembered for his role as the caring and compassionate Carl Winslow. Now, the veteran actor is looking back with ET at his memories of the show.One of the most enduring pop-culture touchstones thatsparked is the character of the Winslow family's nerdy, comically obnoxious next-door neighbor Steve Urkel — played by Jaleel White.Behind the scenes, however, it seems the on-screen frustrations between Carl and Steve mirrored the real-life tensions between VelJohnson and White.«He was a wonderful kid, [but] I think working with him was a challenge,» VelJohnson recalled while speaking with ET's Nischelle Turner. «Working with everybody was a challenge, and there were some moments where he was a little difficult.