I read this sentence in the Guardian today, and I couldn't figure out if it was an error or a regionalism. (I did, however, figure out that I don't know my grammar too well!)
"[the mid-18th century] court...had insisted that everyone kept a straight face."
[the mid-18th century] court...had insisted that everyone kept a straight face.
To my ear, keep seems better than kept, but is one more right than the other?