When Sid and Tony are standing together over Sid's dad, Tony passes Sid a cigarette, which appears back in Tony's hand without Sid ever passing it back.
Anyone else notice when Tony, Chris and Jal are sat on the grass outside the school, and Tony struggles to get a hold of the joint Chris is smoking because of his loss of motor skills after the bus accident. But then when Tony and Sid are standing over Sid's dad's body he is suddenly able to not only pick up the box of cigarettes and a lighter, but lights and smokes it with no issue.
Around 10 minutes in, when Sid's mum walks through the door a crew member with a walkie-talkie to the left of the shot.