Pena and Murphy stay behind when Carillo goes after Pablo. They stand in front of what is supposed to be a police radio. In fact it is a Yaesu FT757 ham radio transceiver set to 7.8686 MHz - which is a frequency with very poor characteristics for communications within a 30 mile radius. No portable radios exist for this frequency.
Around 17:50 the rifle with the scope the soldier is holding is a Galil Ace, you can see the marking on the receiver my the stock, this rifle did not come out until around 2008 and is not correct for the time period this show takes place.
When Limon leaves the church and makes the sign of the cross, his hand moves from his forehead to his left shoulder. He should have moved his hand from his forehead to his belt line, then to his shoulder.