During the final portion, Srivatsan is seen with a file and a mobile phone. But when he undresses his pant to ask sorry to Pasapugazh, both the file and the phone is not visible and he is seen with free hands.
As per the date shown in the college blackboards the time line of the flashback period should be between 1998 and 2002. When Pari uses computer to change words in Srivatsan's speech for Teachers Day, the screen shots clearly show its Windows 7. Windows 7 was only released in 2009.
The movie shows that the course was from 1997-2001. Scooty pep used by the heroine was launched in 2005.
On the first day at class, the blackboard shows the date as 3/6/98 but when showing the degree certificate of the protagonist, the years of study are mentioned as 1997-2001.
During the final portion of the movie, a call is made by Kosaksi Pasapugazh to Srivatsan, which he answers by holding his iPhone upside down.
In the 3 idiots' final year at IEC in 2002, Ria shows them a YouTube video. Ironically, the video-sharing site was launched only in 2005.
iPads are shown being used in the year 2008, when they did not even exist. The Apple product was introduced in 2010.