When Luke is injured from his leg and takes a break from walking, Clem can tell Luke that not all men are bad, and mention how good Lee was as a man. Luke will say he wished he had met him, and smile
Also in episode 5. After offering Kenny some rum he mentions that he misses his boy so much, misses playing catch with him and misses touching Katjaas face. so yes Duck and Lee can be mentioned in all episodes of season 2.
Not just Lee, Duck too.
Episode 1 - There's a picture in the cabin of a duck and Clementine will sigh infront of it.
Episode 2 - The d… moreinner scene when Kenny asks to pass the can.
Episode 3 - Just after Clementine steals the walkie talkie Kenny talks about Duck before going to sleep
Episode 4 - Kenny's speech in the tent.
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https://www.youtube.com/watch?v=BMeH9m6Mpas
Also in episode 5. After offering Kenny some rum he mentions that he misses his boy so much, misses playing catch with him and misses touching Katjaas face. so yes Duck and Lee can be mentioned in all episodes of season 2.