Goofs

In the first scene with the orange soda, Saroo takes one small sip, then hands the nearly full bottle to the woman. She takes a small sip and puts the bottle down, nearly empty. The next cut shows her taking a second sip and the bottle is nearly full again.

Indian railways are generally of 5ft 6in gauge (1676mm). The trains that Saroo travels on are all of this gauge, as are the lines around Khandwa. However, the tracks on which he and his brother are seen walking at the end of the film are metre gauge (3ft 3 1/3 inch).

Kolkata is said to be 1600 kilometers to the east of Khandwa, and even though this is about the length of Saroo's train trip, the distance as the crow flies is really only about 1240 kilometers.

When Saroo is shown traveling to Australia via airplane, the soundtrack that plays when the plane is taking off is that of a train.

This is a deliberate artistic impression, as it is young Saroo's next big journey.

At 1:06:21, Saroo is seen using Samsung Galaxy S in 2008, but the model was released in 2010.

LED signboards on railway platforms never existed in 1986.

Mobile charging points are seen in the railway compartment which didn't exist in 1986.

Several classes of locomotives seen in the movie (the WAP-4 and WDG-4) were not in existence in 1986.

When Saroo is trapped on the train to Calcutta, he is briefly seen near an 'emergency' window with red grilles. Emergency windows were only installed on Indian trains post 2002.

Saroo's train is shown passing a thumbs-up shaped hill in the distance. This hill is located near Ankai in Maharashtra. A train from Khandwa to Calcutta would not pass Ankai as it is in the opposite direction, towards Mumbai.

Saroo has so much trouble finding his hometown because he has the wrong spelling of the town's name. In reality even if he had the wrong spelling he could still find the place since Google would have automatically suggested him the correct spelled version.