The "Bog Man" is seen to "make" his own shoes early on in the film, but later on he can clearly be seen wearing modern shoes with molded rubber soles.
When the group are foraging for food around the cabin, one of them "digs up" a potato. However, it had clearly been placed there, as there were no roots attached and no potato plant leaves above ground.
When Saiorse Reilly strips down to shower, the material covering actress Nora-Jane Noone's breasts can be briefly seen in the shot twice.
The Taxi that Deano drives is repeatedly said to be from Dublin, yet the license plates are from the UK.