Firstly play YBCR anyway whether he is looking or not he is learning.
If he is a very mobile toddler then i suggest labeling your house. Place labels on everything at his eye level then you can walk around pointing out the words on the go reading them to him. This should be enough to teach him some words AND once he knows a few hiss interest level will rocket and you can introduce flashcards and little reader.
Also try flashcards when he is otherwise bored. When finished lunch in the highchair or in the car seat. He can't run away then!