I have a American cousin and she goes to the movies to see a picture, while I go to the pictures to see a film! As they say - two nations divided by a common language!
Being half American, half English, I often use both terms - movies/films. It's very frustrating and it annoys me - I wish I could just use one or the other, but I can't!
Oh - Sat'day mornin' pikchas. Loved 'em. Must have been a blessing for our mums as well. A safe place to lose your kids for half a day. They'd probably wreck the joint now.