Episode 5:

When the l'il green gang releases the carriage carrying Inuyasha's mother, look at the oni's hand that crushes the carriage 15:51 into the episode.A few seconds later when he holds her, she is now the size of the carriage which was crushed, and the oni hasn't changed in size.

Episode 36:

Watch Kouga's wristbands swap, compare the times at 17:51 and 19:27