Meredith sees a pimple on her head and covers it with a Hello Kitty band-aid. When she puts the band-aid on, Hello Kitty's head is upside down, but it is right side up for the rest of the episode.
When a pigeon eats George's bagel at the beginning of the episode, you can clearly see a wire attached to the bird's leg so it wouldn't fly away.
When the pigeon starts eating George's bagel which he dropped on the pavement, you can clearly see a red clasp with a long wire attached to its left leg so that it won't fly away.