Steganography doesn't work as pictured here. More likely you could have two audio or image files, between which every sample or pixel only differ a little, so the "carrier" file (into which the hidden data is encrypted) would sound or look OK. The person who has the "key" file, would then compare the key file with the encrypted file, byte by byte, to extract the encrypted data. However, this method can't hide a file with resolution equal to the carrier file resolution (one or perhaps two bits per byte only). So the image of the girl couldn't have been encrypted into the picture of the house without visibly distorting the data.
During the set-up for the assault led by Megan, an agent is holding an MP5 machine pistol with the clip loaded backwards.
When Don wakes Alan up, he says it's 1am but through the window behind him you can clearly see it is daytime
At about 10m30s, the technician was clearly not really typing, but the audio had her punching a set of keys for the .jpg file that Charlie pointed out.
At roughly the 30-31 minute mark when Colby and Megan are questioning the motel manager, one of the camera operators is briefly reflected in Colby's glasses.