Visible crew/equipment: After the demonstration at the blackboard, the big group of soldiers walk over to the big table with the picture of the world on it. As they walk away from the blackboard, they turn and walk down some steps, and as they do you can see the shadow of a boom mic pole on the upper side of the grey part of the wall. (00:55:40)
Audio problem: When Dr Forrester and Sylvia are hiding in the farmhouse, just after the Martian eye enters the room, Dr Forrester says "An electronic eye - like a television camera" - however when he says "camera", his lips don't match the word. (00:46:45)
Continuity mistake: When the school bus is leaving Pacific Tech, the name "Southridge" is painted directly on the front of the bus. When Dr. Forrester finds the wrecked vehicles in the city later in the film, the name "Southridge" is now painted on a separate wooden sign that he picks up.
Continuity mistake: When Dr. Forrester and Sylvia are eating in the farm house, as Forrester sits down he reaches for Sylvia's cup then commences to pour coffee in it. Yet in the following shot he no longer is holding the cup, and the cup has jumped back to its original place on the table. (00:42:50)
Visible crew/equipment: When the martian space ships first appear you can see the wire suspending the models. You can clearly see the wires every time you see a martian or martian space ship.
Continuity mistake: Look closely when the Martian "spaceships" make their first appearance, underneath are three electro-magnetic legs supporting it meaning they walk rather than fly, much like the tripod war machines in the original book, yet after this scene they can't be seen again. The studio opted to forgo the use of this special effect after this particular shot. (This is best seen on the DVD version of the film.)
Continuity mistake: The aeroplane flying the atomic mission against the Martian invaders is seen on the display console before the radar beam detects it.
Visible crew/equipment: When the radio reporter is broadcasting before the first attack, he is speaking into a microphone connected to the radio truck. After the Martians begin shooting, he dives into a small ravine. You can see his microphone cord being manipulated off camera to the right where it is being cut by a crew member.
Continuity mistake: One of the reporters refers to a Martian attack on Rangoon, India. Rangoon (now Yangon) is in Burma (now Myanmar), and while Myanmar had been governed as part of India under the British Raj, it achieved independence in 1948.