When Sayid is looking through one of the heroin bags, there's a close-up of his hands and his nails are quite long, but in the next shot his nails are clipped.
In Solitary (2004) Sayid tells Rousseau that Nadia is dead because of him and that for the past seven years he had been holding on to "a blind hope that somewhere she's still alive". However, in this episode it is established that Sayid already knew that Nadia was alive (the CIA assured him of that and showed him pictures of her). Indeed, the reason he was on the Oceanic flight to LA in the first place was to meet with her.
When Sayid is playing soccer in the park and stops to talk, his hair is messed and a mop of it folds down on his forehead. In some, but not all, subsequent shots there's nothing on his forehead.
The Australian Secret Intelligence Service (ASIS) is responsible for foreign intelligence gathering, and would never be directly involved in a domestic security operation as depicted in the episode. Domestic security is the responsibility of the Australian Security Intelligence Organisation (ASIO). In addition, the acronym ASIS is normally pronounced 'Ay-sis', rather than spelled out.
Sayid questions Locke at gunpoint. When he asks about "the hatch," he raises his thumb as if to undo the safety catch and a click is heard. As can be seen from its boxy shape and lack of hammer, the pistol is a Glock, which has no safety catch.
When Sayid is questioning Locke at the downed Beechcraft airplane regarding the hatch, he points the pistol Locke took from the dead fake Nigerian priest at him. He then makes a motion handling the pistol and there is a sound effect as if he is cocking the pistol's hammer. The pistol is a Glock whose firing mechanism is entirely internal. It does not have a hammer to cock.
When Sayid goes to Essam's house, two of Essam's friends are playing Half-Life 2 on PlayStation 2. Both of them are holding controllers, while Half-Life 2 is only a single-player game.
As Essam's friends are playing Half-Life, the player says he is out of ammo, and his buddy advises him to use the crowbar, but he refuses, saying that the crowbar is only good against zombies, not the big bugs. However, the section of the game the TV screen indicates that he's playing is the Silo's Ventilation Airshaft, and the only enemies in this section are zombies and headcrabs. Headcrabs are even easier to beat with the crowbar than zombies are.
When Sayid and Essam sit in the truck with explosives, Sayid says "Her name is Nadia, they know where I can find her," and in the shot facing Essam, when he is done with that line, Sayid's mouth continues to move, but nothing is heard.
When Sayid exits the back of the white van, the reflection of the Steadicam and the Steadicam operator is reflected in the door that he closes, as he quickly moves away.
All scenes with major characters that depict Australia are clearly not shot in Australia. When Sayid is met outside a suburban Sydney shop the 'No Parking' sign is on the wrong side of the road (or facing the wrong direction) and it is not a standard Australian traffic sign. Scenes depicting iconic Australian locations either do not have close-ups of major characters (eg when Sayid is playing football/soccer with Essam, the Sydney skyline is only shown in distant shots where the actors are not clearly recognizable) or they are clearly CGI'ed in (eg the scene of Boone's hotel room where Opera House is visible outside in Hearts and Minds (2005)). The electrical outlets/sockets and light switches shown in all indoor "Sydney" scenes are not Australian outlets/sockets or switches. Car license plates (called "number plates" in Australia) are clearly Hawaiian and faked to look Australian, and whilst the vehicles depicted are right-hand drive vehicles, not all of them are models generally available through car dealerships in Australia.
Sayid and Essam are sitting in a plaza, and you can see newspaper boxes over their shoulders. Australia doesn't have newspaper boxes.