During the first time travel experience, Mani travels back in time thrice. But we can see the clocks in his shop showing different time even though he returns back to the same time, i.e., a clock showing 5.50 didn't show the same even after Mani returned to the time period.
In the opening scene, a old bungalow is shown as Sethuraman's place which bears a name plate written in Telugu (in the Tamil version) . However the same gets replaced by a Tamil one in the following scenes.
Mataji (saranya) discloses to Mani that she fed him mothers milk unable to see him crying the day she brought him home thus becoming his non-biologically biological mother. As a matter of fact a woman cannot produce mothers milk until pregnant and saranya had never even got married in the movie.
According to the plot of the movie that watch can take you back only back and forth 24 hours and all the things before will be back in place(eg. objects) but after killing Mani and when Athreya goes back in time he says Mithran to keep the watch in Mani's place so that he doesn't suspect.