The Deadly Years
Mistake I Thought Was Made
The Romulan plasma weapon was considered a horrendously dangerous threat to the Enterprise just the year before in "Balance of Terror" yet in "The Deadly Years" Enterprise takes multiple hits from the plasma weapon without suffering significant damage.
Why It's Not A Mistake
Watch the original version of the episode carefully. Technically, the visual effect of the Romulan ship firing the plasma weapon at the Enterprise (Balance of Terror stock footage) occurs only three times. One can presume that the Enterprise since "Balance of Terror" has modified its shields to be more effective against plasma bolts.
All the other Romulan strikes are by Klingon style photon torpedoes (Errand of Mercy stock footage). And as we saw in "Errand of Mercy", Enterprise is pretty effectively shielded against those weapons.
So it probably is not a mistake that Enterprise even after three plasma weapon hits and more than a dozen photon torpedo strikes is still able to haul ass at Warp 8 and get away clean.
Mistake I Thought Was Made
The Romulan plasma weapon was considered a horrendously dangerous threat to the Enterprise just the year before in "Balance of Terror" yet in "The Deadly Years" Enterprise takes multiple hits from the plasma weapon without suffering significant damage.
Why It's Not A Mistake
Watch the original version of the episode carefully. Technically, the visual effect of the Romulan ship firing the plasma weapon at the Enterprise (Balance of Terror stock footage) occurs only three times. One can presume that the Enterprise since "Balance of Terror" has modified its shields to be more effective against plasma bolts.
All the other Romulan strikes are by Klingon style photon torpedoes (Errand of Mercy stock footage). And as we saw in "Errand of Mercy", Enterprise is pretty effectively shielded against those weapons.
So it probably is not a mistake that Enterprise even after three plasma weapon hits and more than a dozen photon torpedo strikes is still able to haul ass at Warp 8 and get away clean.