The opening shot in the Bellero house, showing Richard operating the laser while Richard, Sr. drinks a glass of wine, is repeated a few shots later.
A laser beam travels at the speed of light; so, when fired from a weapon, the beam should hit its target instantly rather than appearing to move.
The being says his atmosphere is made of light then asks how Richard was able to synthesize such compounds. Light is a form of electromagnetic energy, it is not a compound. Compounds are made of atoms of matter, not energy.
The LASER beam is seen moving up, falling back, and moving up into space like liquid being pumped into a tube. Light moves so fast that it would appear instantly.
At 36 minutes, the chamber effect that makes Judith's voice sound as if it's in a cavern isn't shut off fast enough to avoid affecting the subsequent voice of Richard Sr. The same problem occurs at 47:10 when the shield is shut off and Judith's voice can still be heard in a cavernous condition for three seconds.
The alien shield which is supposed to be an energy shield is seen to shake and vibrate like it is Plexiglas's, which it is, rather than an energy shield.
The platform used to lower the alien being down the laser beam is faintly visible.