In the "Venice" scene when they bump into each other and the roses go flying, a tie around the flowers is clearly visible, but when they come down the tie is missing and the flowers are loose, with no evidence of the tie.
Around 15 minutes in, when a gay soldier talks to Sameer and Kunal, Kunal first faces the soldier, then suddenly his body is facing the vendor when his head was facing the soldier.
When Sameer gives Neha an album with their photos on her birthday, when she turns to the last page and wonders there is no photo, she turns above even before Sam lifts his camera hand up.