When the team lure the dinosaur into the arena, Abby turns the lights and sound on to distract the creature. The song that plays is "Don't Stop Movin" by S Club 7. Hannah Spearritt, who plays Abby, was a member of this group. She seems to roll her eyes when she hears the song.
Season 4 followed a set of web-only prequels (webisodes) that introduced several new characters and established their relationships, provided exposition for what happened to the regulars after season 3, and explained why the changes in the Anomaly operation occurred. These webisodes were initially only available via the ITV website and aired beginning December 22, 2010.
The end scene in the Arena Venue, is actually the building in Dublin, formerly known as The Point Depot, before its major upgrade to the O2 Dublin Arena. Located by the East Link Toll Bridge, over the River Liffey, in Dublin Docklands. Other buildings seen in the episode, and the remaining 13 episodes are in the same general area of Dublin Docklands.
The song Abby plays in the arena to distract the Spinosaurus is Don't Stop Movin by her former band S Club 7.
The remaining 13 episodes were shot at various locations within the Republic of Ireland, some with none to major digital set dressing enhancement.