During the "confession" when Elliot is interrogating Elijah, as the camera cuts back and forth between two different angles, their foreheads are alternately touching and not touching.
Stabler says that the word Infantry comes from Ancient Rome where the youngest soldiers ("infants") were put in the front line. In reality, the term arose in 16th century Spain, where royal princes (Infantes) were given command over foot soldiers, and these were named in turn Infantería. Spanish infante and English infant have a common root in Latin infans, meaning "voiceless".