Final answer:
The sentence contains an error in the use of the word "calm." It should be in its adverb form "calmly" to modify the verb "walked."
Step-by-step explanation:
The error in the sentence "During the chaotic and frenzied celebrations on New Year's Eve, Jason walked calm and cool through town." is in the underlined part "calm and cool." The adverb form of "calm" should be used to describe the verb "walked."
Therefore, the correct word should be "calmly." The modified sentence should read as follows: "During the chaotic and frenzied celebrations on New Year's Eve, Jason walked calmly and cool through town." It is important to use adverbs to modify verbs to ensure that sentences convey the intended meaning clearly and accurately.