If the Kalulu incident was a penalty then we'd have even more ridiculous penalties in Serie A. The key is to see whether his hand is in an unnatural position, not solely whether the ball and hand made contact. Abraham, for example, actually moved his arm towards the ball, touching it and changing its trajectory.
(speaking of Roma: anyone know what happened to that dude who was a Milan fan then became a Roma one...the guy who literally vlogged from his mom's basement and advertised store-bought tomato sauce?).