Common Runway Mistakes and How Agencies Avoid Them

Runway generates short video clips, typically a few seconds to around ten seconds each, from a prompt, an image or a video reference. Later models added better motion, character consistency through references, and camera direction. Its editing tools cover background removal, expanding the frame, slow motion and changing parts of a scene.

It works best for mood shots, transitions, product backgrounds, concept visuals and social clips. It is weaker at long continuous scenes, exact product details, readable text in the frame and complex hand or face movement over time. Knowing this split prevents most of the mistakes below.

Four mistakes account for most wasted generations and most client rejections. Each has a simple fix that costs little to put in place.

Mistake 1: Writing prompts like a mood board

Prompts such as “cinematic, epic, beautiful lighting” give random results. Runway responds better to the language of a shot list: subject, action, camera, light and setting.

Compare “epic shot of a car” with “a silver hatchback drives along a coastal road at sunset, camera tracks alongside at wheel height, warm low light, light haze over the sea”. The second gives the model something to follow. Agencies keep a prompt template per project and fill it for each shot.

Mistake 2: Starting from text when an image exists

Text-to-video invents everything, including the product. If the client has an approved photo or render, use image-to-video instead and let Runway animate from that frame. The look stays closer to the brand and the product keeps its shape for longer.

For multi-shot pieces, generate or choose a set of keyframes first, approve them with the client, then animate. Approving stills is faster and cheaper than approving video.

Mistake 5: Accepting inconsistent shots

Inconsistency between shots is the most visible amateur sign. A character’s jacket changes colour, the light shifts, the product grows a new button.

• Use the same reference images for every shot of a character or product.
• Keep the same style words and lighting description across prompts.
• Lock the seed where the tool allows, when you want close variations.
• Generate several takes per shot and pick the most consistent ones.
• Grade all clips together in an editor such as Premiere Pro or DaVinci Resolve.

The last step is often skipped. A common colour grade hides small differences that prompts cannot.

Mistake 3: Ignoring shot length

Long generations drift. Motion that looks fine in the first three seconds can warp by the eighth. Plan edits around short shots and cut on action, as in normal editing. A 30-second social ad is often eight to twelve short shots, not three long ones.

Mistake 4: Letting AI handle the text and the product details

Generated video still struggles with legible letters and exact logos. Never rely on it for the brand name, price or legal line. Add text, logos and packshots in the editor as overlays from the original files. Where the product must appear accurately, film or render it and use Runway for the environment around it.

Review AI video more closely than filmed footage, because errors are subtle and appear for a few frames.

• Watch every clip at full resolution, frame by frame where motion is complex.
• Check hands, faces, teeth and limbs for distortion.
• Look for objects that appear or vanish between frames.
• Confirm no logos, trademarks or recognizable people were generated by accident.
• Check that movement obeys basic physics, such as liquid pouring down.

Keep a rejected-clip folder with notes. It becomes a training resource for prompts on the next project.

Read Runway’s current terms on ownership and commercial use for your plan. Do not upload footage or images you do not have rights to as references, and avoid prompts that imitate a living artist or a specific actor. Some ad platforms and markets have rules on disclosing AI-generated or altered content, particularly for political and social issue ads. Check the current policy of each platform before launch.

Runway plans work on credits, and each generation uses credits depending on model, length and resolution. Teams new to the tool often spend most of a month’s allowance in the first week on exploration. Set a rough budget per project: a number of takes per shot, a limit on exploratory prompts, and a rule that final-resolution renders happen only after the low-cost draft is approved. Track generations per approved shot; when that number falls over a few projects, the prompts and planning are getting better.