My nitpicks are as numerically proceeds:
1) Not truly a nitpick, but the character of Susan is portrayed by the same actress who plays Marita Covarrubias in The X-Files. Her legitimate identity is Laurie Holden. She is the third thespian from The X-Files to appear in The Outer Limits. William B. Davis (Cigarette-Smoking Man/Cancer Man/Raul Bloodworth/C.G.B. Spender) appeared in "The Conversion" (a personal favorite of mine) and "Out of Body," while Nicholas Lea (Alex Krycek) appeared in "Made in Our Image" and "The Inheritors."
2) The gray coloring leaves Andrew's hair beyond the aftermath of his inchoative trip through time. And there is no explanation as to why this is so presented at any time.
3) Once a time-traveler makes the leap backward through time, the current time stream ought to be, more or less, already altered, considering the slightest interaction that time-traveler has with the past shall result in inevitable, unavoidable changes. Yet, Andrew's second departure is observed by two security guards and Ted, even after Andrew successfully descends into the past. Then again, the entire process of time-travel remains quite theoretical at this stage.
4) Andrew's obsessive pursuit in protecting his wife subsequently leads him to in actuality be the killer of his wife. After inadvertently shooting his wife, he decides to go backward through time to alter their first meeting. He succeeds, thus proving time can indeed be altered. However, the very fact that his leaping forward through time imbibed into him the image of his wife being murdered and thereby influenced his behavior, ultimately causing him to shoot his wife, seems to flow in accordance to the Time Loop Theory, which clearly states that time cannot be altered and that all events (past, present, and future) are or can be intertwined.

That was pointless.